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strncasecmp.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2006 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include <ast.h>

#if _lib_strncasecmp

NoN(strncasecmp)

#else

#include <ctype.h>

#undef      strncasecmp

int
strncasecmp(register const char* a, register const char* b, size_t n)
{
      register const char*    e;
      register int            ac;
      register int            bc;
      register int            d;

      e = a + n;
      for (;;)
      {
            if (a >= e)
                  return 0;
            ac = *a++;
            if (isupper(ac))
                  ac = tolower(ac);
            bc = *b++;
            if (isupper(bc))
                  bc = tolower(bc);
            if (d = ac - bc)
                  return d;
            if (!ac)
                  return 0;
      }
}

#endif

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